Study on Tribological Behavior Based on 2D Zn-MOFs Interface Enrichment of Oil-In-Water Emulsion

Abstract For the first time, we attempt to use two-dimensional Zn-based metal organic framework (2D Zn-MOFs) nanosheets as emulsifiers and additives in oil-in-water emulsions, including 2D Zn(Bim)(OAc) (1) nanosheets, 2D Zn(Bim)(OAc) (2) nanosheets and 2D ZnBDC nanosheets. The emulsification results showed that the prepared emulsion was uniform and stable, and 2D Zn(Bim)(OAc) (1) emulsion has the most significant performance in terms of anti-friction and anti-wear performance and improvement of extreme pressure performance. Compared with the base emulsion, the friction coefficient and wear volume were reduced by 22% and 53.6%, respectively, while the last non-seizure load (PB) was increased by 15.5%. Finally, the friction mechanism was discussed and proposed.

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Tribological Properties of Oil-in-Water Emulsion with Carbon Nanocapsule Additives

Materials ◽

10.3390/ma13245762 ◽

2020 ◽

Vol 13 (24) ◽

pp. 5762

Author(s):

Yeau-Ren Jeng ◽

Ping-Chi Tsai ◽

Ching-Min Chang ◽

Kuo-Feng Hsu

Keyword(s):

Pure Water ◽

Working Fluid ◽

Wear Volume ◽

Wear Properties ◽

Wear Performance ◽

Water Emulsion ◽

A Value ◽

Oil In Water ◽

Carbon Nanocapsules ◽

Oil In Water Emulsion

An experimental investigation was performed on the coefficients of friction (COFs) and wear properties of pure water and oil-in-water (O/W) working fluids containing carbon nanocapsules (CNCs) with concentrations ranging from 0 to 1.0 wt.%. For the O/W working fluid, the ratio of oil to water was set as 6%. It was shown that for the water working fluid, the COF decreased by around 20% as the CNC content increased from 0 to 1.0 wt.%. In contrast, the wear volume increased by 50% as the CNC addition increased from 0 to 0.5 wt.%, but it fell to a value slightly lower than that achieved using only pure water (i.e., no CNCs) as the CNC content was further increased to 1.0 wt.%. For the O/W emulsion, the addition of 0.8 wt.% CNCs reduced the COF by around 30% compared to that of the emulsion with no CNCs. Overall, the results showed that while the addition of a small quantity (6%) of oil to the water working fluid had a relatively small effect on the wear performance, the addition of an appropriate quantity of CNCs (i.e., 0.8 wt.%) resulted in a significantly lower COF and an improved wear surface.

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Facile fabrication of hydrogel coated membrane for controllable and selective oil-in-water emulsion separation

Soft Matter ◽

10.1039/c8sm00139a ◽

2018 ◽

Vol 14 (14) ◽

pp. 2649-2654 ◽

Cited By ~ 14

Author(s):

Qingdong Zhang ◽

Na Liu ◽

Yen Wei ◽

Lin Feng

Keyword(s):

Selective Separation ◽

Water Emulsion ◽

Oil In Water ◽

Emulsion Separation ◽

Facile Fabrication ◽

Oil In Water Emulsion ◽

First Time ◽

Coated Membrane

For the first time, we report that the hydrogel-networks coated membrane exhibits selective separation for cationic and nonionic types of surfactants-stabilized emulsions.

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Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

10.26434/chemrxiv.9860891.v1 ◽

2019 ◽

Author(s):

Timothée Stassin ◽

Ivo Stassen ◽

Joao Marreiros ◽

Alexander John Cruz ◽

Rhea Verbeke ◽

...

Keyword(s):

Vapor Phase ◽

Metal Organic Framework ◽

Chemical Vapor ◽

Uptake Capacity ◽

Powder Synthesis ◽

Crystalline Films ◽

Metal Organic ◽

Mesoporous Metal ◽

First Time ◽

Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

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